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Welcome at joint annual congress of S.A. Pharmacological Society, Physiological Society of Southern Africa, and Bio-medical Engineering Eociety of South Africa

  • Authors: Henderson, Derek Scott
  • Date: 1980-10-15
  • Language: English
  • Type: Text
  • Identifier: vital:7413 , http://hdl.handle.net/10962/d1018290
  • Full Text:
  • Date Issued: 1980-10-15

Modelling the performance of a calorifier installed at a university residence intended to be retrofited by an air source heat pump

  • Authors: Mzolo, Noluthando Precious Duduzile
  • Date: 2017
  • Subjects: Caloric engines Heat pumps
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: http://hdl.handle.net/10353/4660 , vital:28485
  • Description: Sanitary hot water production contributes significantly to the electrical energy consumption in the university campus. An in-depth understanding of the current hot water technology, number of students, capacity of water used per student, time of use of hot water, total volume of hot water consumed and the total energy used on an average weekday in a university residence are very crucial in opting for energy efficient technology like an air source heat pump (ASHP) water heater. The study focused on quantitative and qualitative analysis of data collected for the hot water profiles in one of the university residences (Elitheini 1) from the conduction of experiment and questionnaires. The results revealed that 94% of the 75 students used hot water during the Eskom morning peak and 61% during the Eskom evening peak. In addition, the average daily energy consumption of the 12 kW Calorifier was 139.49 kWh, while the measured volume of hot water usage was 1950 L which is in strong agreement with the total volume (1945 L) of hot water consumption from the questionnaires. The p-value of the average volume of hot water usage measured by experiment and questionnaires was 0.7 and is of no mean significant difference. The monthly energy consumption for the week days was projected to be 2929.31 kWh. By retrofitting of calorifier with an ASHP unit, the energy consumption could reduce to 976.43 kWh based on its consecutive coefficient of performance of 3. Finally, from the energy consumption reduction analysis and the current Eskom tariffs, it can be alluded that the payback period of the proposedASHP unit as a retrofit to the calorifier is going to be less than 2 years and is worthy to invest into such technology under this study due to its favourable payback period and the reliability and lifespan of the ASHP unit.
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  • Date Issued: 2017

South Asian diasporic women's short fiction: the South African contribution

  • Authors: Naidu, Samantha
  • Date: 2007
  • Language: English
  • Type: Article , text
  • Identifier: vital:26376 , http://hdl.handle.net/10962/54037 , https://orcid.org/0000-0001-9456-8657
  • Description: Although Indian Women S Short Fiction Has Always Enjoyed Equal Importance And Popularity As Their Novels, Very Little Critical Attention Has Been Paid To It So Far. Indian Women S Short Fiction Seeks To Fulfil This Long Felt Need. It Puts Together Fifteen Perceptive And Analytical Articles By Scholars Across The World. The Articles, Which Are Focussed On Native Indian Writing As Well As Diasporic Short Fiction, Deal With Such Interesting Literary Issues As Construction Of Femininity, Disablement And Enablement, Bengali Heritage, Hybrid Identities, Nostalgia, Representation Of The Partition Violence, Tradition And Modernity, And Cultural Perspectivism.
  • Full Text: false
  • Date Issued: 2007

The management of conflict between employees: a case study of an information technology company in Johannesburg

  • Authors: Monakali, Robin
  • Date: 2019
  • Subjects: Conflict management -- South Africa -- Johannesburg , Conflict management -- Case studies Interpersonal relations Personnel management -- Psychological aspects Management
  • Language: English
  • Type: Thesis , Masters , MA
  • Identifier: http://hdl.handle.net/10948/41997 , vital:36616
  • Description: The global working environment has transformed significantly over the last two decades, with rapid advancements in technology and information as well as the levels of diversity in the workplace. This process of adaptation, the failure to adapt or weaknesses in adaptation can be an underlying cause of conflict within organizations. For an organization to be successful, there must be effective conflict management techniques in place in order to resolve or keep the conflict at a minimum. The aim of this exploratory case study was to therefore explore the management of conflict between employees in an Information Technology company in Johannesburg. The human needs theory, which states that the deprivation of human needs is a major source of conflict, was used as the theoretical framework guiding this study. A mixed methods approach, also known as methodological triangulation, was used, which involved combining qualitative and quantitative research methods in order to achieve triangulation of data. The qualitative research method that was used comprised individual semi-structured interviews with two Human Resources managers and the quantitative research method involved the completion of self-administered questionnaires by 94 employees of the IT company. The researcher used a purposive sampling design for the interviews and simple random sampling for the questionnaires. Ethics permission for this research was received from Nelson Mandela University’s Research Ethics Committee and the study was conducted in accordance with the university’s Policy on Research Ethics. The findings of this study have revealed that the type of conflict mainly experienced in this organization was employee conflict, due to interpersonal clashes relating to personality differences. The employees were unanimous that conflict can have both a positive and negative effect. The interviews confirmed that the IT company makes use of negotiation and mediation to resolve workplace conflict, with the literature review providing evidence that negotiation and mediation are useful means of managing conflict between employees. However, the results from the completed questionnaires revealed that employees attempt to manage conflict by avoiding the conflict, which could be due to employees having limited awareness of the organization’s procedures to address conflict. This study can therefore potentially be beneficial to organizations and assist the latter in developing conflict management skills and practices, which can enhance organizational performance, productivity and employee retention.
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  • Date Issued: 2019

A model for privacy-aware presence management in mobile communications

  • Authors: Ophoff, Jacobus Albertus
  • Date: 2011
  • Subjects: Mobile communications systems , Mobile communication systems -- Management
  • Language: English
  • Type: Thesis , Doctoral , PhD
  • Identifier: vital:9757 , http://hdl.handle.net/10948/1354 , Mobile communications systems , Mobile communication systems -- Management
  • Description: As humans we find communicating natural and compelling. Over the centuries we have created many innovations which enable and improve communication between people; during the past decade mobile phone networks have brought about a technological revolution in this area. Never before have people been so connected to one another. Today we have the ability to communicate with almost anyone, anytime, anywhere. Our increased connectivity and reachability also leads to new issues and challenges that we need to deal with. When we phone someone we expect an instant connection, and when this does not occur it can be frustrating. On the other hand it is equally disruptive to receive a call when one is busy with an important task or in a situation where communication is inappropriate. Social protocol dictates that we try to minimize such situations for the benefit of others nearby and for ourselves. This management of communications is a constant and difficult task. Using presence – which signals a person’s availability and willingness to communicate – is a solution to this problem. Such information can benefit communication partners by increasing the likelihood of a successful connection and decreasing disruptions. This research addresses the problem of staying connected while keeping control over mobile communications. It adopts a design-science research paradigm, with the primary research artifact being a model for privacy-aware presence management in mobile communications. As part of the model development knowledge contributions are made in several ways. Existing knowledge about the problem area is extended through a quantitative analysis of mobile communications management. This analysis uses a novel survey, collecting useful empirical data for future research. This includes how people currently manage their communications and what features they expect from a potential “call management” system. The examination and use of presence standards, as a foundation for the model, provides a comparison of the main presence technologies available today. A focus on privacy features identifies several shortcomings in standards which, if addressed, can help to improve and make these standards more complete. The model stresses the privacy of potentially sensitive presence information. A unique perspective based on social relationship theories is adopted. The use of relationship groups not only makes logical sense but also assists in the management of presence information and extends existing standards. Finally, the evaluation of the model demonstrates the feasibility of a practical implementation as well the ability to extend the model in next generation mobile networks. Thus the model presents a solid foundation for the development of future services. In these ways the proposed model contributes positively towards balancing efficient mobile communications with the need for privacy-awareness.
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  • Date Issued: 2011

Assessing authentic leadership and workplace trust amongst managerial government employees in Lesotho

  • Authors: Damane, Likeleko
  • Date: 2016
  • Subjects: Leadership -- Moral and ethical aspects , Industrial management
  • Language: English
  • Type: Thesis , Masters , MA
  • Identifier: http://hdl.handle.net/10948/9033 , vital:26458
  • Description: In today‘s world, characterised by highly competitive global economies, organisations have realised the need for a positive approach in order to remain competitive, sustainable and to attract and retain talent. A positive approach to leadership and an organisational environment characterised by trust has been one of the fundamental tools towards achieving this goal. The main objective of the present study was to assess the existence of positive organizational approaches (authentic leadership and workplace trust) within the government of Lesotho, especially at a time when the country was facing difficulties. The study was descriptive in nature, and followed a non-experimental quantitative approach. The survey made use of a sample of 153 civil servants occupying positions from supervisory to senior management. Data was acquired through the use of an electronic questionnaire made up of two scales: one was a self-assessment instrument on authentic leadership adopted from Walumbwa and associates, and the other scale was on workplace trust developed by Natalie Ferres. The analysis of data involved descriptive statistics, t-tests, ANOVA, post hoc tests and Cohen‘s d. The results of the study provided evidence that there were high levels of the authentic leadership and trust in the workplace. Demographic variables were not found to influence the outcome of authentic leadership scores, however, education and managerial level were found to have an influence on organisational trust. The findings of the study provoked the researcher to call for an implementation of policy on positive training for management and for further research in this area.
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  • Date Issued: 2016

A poverty alleviation strategy of Vukuzenzele gardening project in Motherwell township

  • Authors: Zitho, Andiswa
  • Date: 2017
  • Subjects: Economic development projects -- South Africa -- Port Elizabeth , Economic development -- South Africa -- Port Elizabeth Community development -- South Africa -- Port Elizabeth Poor -- South Africa -- Port Elizabeth
  • Language: English
  • Type: Thesis , Masters , MA
  • Identifier: http://hdl.handle.net/10948/13724 , vital:27302
  • Description: Poverty is one of the issues that affects the development in our country. the strategies that are used differ from one to person to another. development is said to be measured through a lot of things but mostly through economic growth which influenced by poverty. the purpose of this study was to investigate the effectiveness of the strategies being used to alleviate poverty in the Motherwell township, in Port Elizabeth. The study focused mainly on Vukuzenzele gardening project, where a sample of 15 participants were purposovely selected to be part of the study. Furthermore, the aim of the study was to contribute towards community development by investigating the social issues that directly influence poverty eradication.
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  • Date Issued: 2017

What is the StreetNet Association?

  • Authors: StreetNet Association
  • Date: 2000
  • Subjects: StreetNet Association
  • Language: English
  • Type: text
  • Identifier: http://hdl.handle.net/10962/162148 , vital:40765
  • Description: StreetNet was conceived by a network of individual vendors, activists, researchers and other people and institutions, who came together to look at how to increase the visibility, voice and bargaining power of street vendors throughout the world. StreetNet aims to promote the exchange of information and ideas on critical issues facing street vendors and on practical organizing and advocacy strategies. Through StreetNet, members should gain an understanding of the common problems of street vendors, develop new ideas for strengthening their organizing and advocacy efforts and join in international campaigns to promote policies and actions that can contribute to improving the lives of millions of street vendors.
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  • Date Issued: 2000

Smallholder farmer's climate change knowledge in Ngqushwa Local Municipality, Eastern Cape : implications on coping and adaptation

  • Authors: Shoko, Witness Alvis
  • Date: 2017
  • Subjects: Climatic changes -- South Africa -- Eastern Cape Farms, Small -- South Africa -- Eastern Cape Sustainable agriculture
  • Language: English
  • Type: Thesis , Masters , MSoc
  • Identifier: http://hdl.handle.net/10353/6480 , vital:29744
  • Description: Lack of knowledge about climate change poses a greater risk to human development in general. This study emerges from the premise that agriculture, and more specifically smallholder farmers, are the most affected by climate variability due to the type of assets they hold. Among other factors, climate change can directly and adversely impact the ability of smallholder farmers to sustain their livelihoods. Taking into consideration spatial differences across Ngqushwa Local Municipality, smallholder farmers in different areas have to understand the constraints they face that emanate from climate change. The study aimed to explore the knowledge that smallholder farmers in Ngqushwa local municipality have on climate change, strategies they utilise to cope and minimise the detrimental effects of climate change. The study also focused on climate change information sources namely, meteorological and Indigenous Knowledge (IK) that smallholder farmers have at their disposal for coping and adaptation to climate change. Furthermore, the study analyses comprehensiveness and usefulness of information that the resource-poor farmers possess. The findings of this study show that smallholder farmers in Ngqushwa local municipality access climate change information through televisions, newspapers and listening to the radio. Their knowledge of the behaviour of birds, moon, wind, and insects is also an important source of forecasting weather patterns. Recommendations from this study include the following: enhancing and widening the sources of climate change information, education encompassing the nature of climate change, networking of smallholder farmers, linking meteorological and indigenous knowledge and supplementing natural water supply.
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  • Date Issued: 2017

Rhodos, Vol. 3, No. 14

  • Date: 1991-10-17
  • Subjects: Rhodes University -- Rhodos , Grahamstown -- Newspapers
  • Language: English
  • Type: Text
  • Identifier: vital:14831 , http://hdl.handle.net/10962/d1019070
  • Description: The Rhodos newsletter carries news and information about events, awards, projects and developments both on and off campus. Ten editions of Rhodos are printed throughout the academic year for distribution among staff members of the University
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  • Date Issued: 1991-10-17

Point-of-care and lung ultrasound incorporated in daily practice

  • Authors: Neethling, E , Roodt, F , Beck, C , Swanevelder, J L C
  • Date: 2018
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/11260/5248 , vital:44424 , http://www.samj.org.za/index.php/samj/article/view/12293
  • Description: Point-of-care ultrasound (POCUS) is a fast-growing clinical utility and is becoming an essential clinical skill for all practitioners attending to critically ill patients. Ultrasound equipment is now smaller, more affordable and readily available in clinical work areas. POCUS is performed by a non-cardiologist physician at the patient’s bedside as an adjunct to the physical examination. It is easily taught, non-invasive and allows for real-time clinical information. Bedside use of ultrasound imaging aids with rapid diagnosis of severe and life-threatening pathological conditions. It can be repeated, may change clinical management, and impact on patient outcome. POCUS has a broad clinical use, including, but not limited to, focused assessed transthoracic echocardiography (FATE), lung ultrasound imaging, extended focused assessment with sonography for trauma (e-FAST), vascular access and regional blocks. It may also be extended to detect endotracheal intubation and the estimation of intracranial pressure. Assessment of cardiac pathology by POCUS, performed by a novice examiner, has been shown to compare with the gold standard of an expert. Training is paramount. The physician should know his limitations and always relate the information back to the clinical scenario and context. By incorporating POCUS as part of our armamentarium and into our daily medical practice, we might see it reach its full clinical potential, optimising patient care and improving patient outcomes.
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  • Date Issued: 2018

Main thesis title map: subtitle if needed. If no subtitle follow instructions in manual

Photophysical properties of newly synthesized fluorinated zinc phthalocyanines in the presence of CdTe quantum dots and the accompanying energy transfer processes

  • Authors: Erdoğmuş, Ali , Moeno, Sharon , Litwinski, Christian , Nyokong, Tebello
  • Date: 2010
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/262671 , vital:53543 , xlink:href="https://doi.org/10.1016/j.jphotochem.2009.12.014"
  • Description: The photophysical properties of two newly synthesized phthalocyanines (Pcs) were studied in the presence and the absence of 3-mercaptopropionic acid (MPA) capped quantum dots (QDs). Energy transfer processes resulting from the combination of QDs and the Pcs: 4-(tetrakis-5-(trifluoromethyl)-2-mercaptopyridinephthalocyaninato)zinc(II) (TtfmMPyZnPc, 3) and 4-(tetrakis-5-(trifluoromethyl)-2-pyridyloxyphthalocyaninato) zinc(II) (TtfmPyZnPc, 4) were also studied. The photophysical properties of the Pcs in the presence of QDs were enhanced and Förster resonance energy transfer (FRET) was observed with the phthalocyanines used. The efficiency of FRET between the QDs and TtfmMPyZnPc and TtfmPyZnPc was found to be 0.31% and 0.45% in DMSO and 0.24% and 0.32% in pyridine, respectively. The triplet state quantum yields for TtfmMPyZnPc and TtfmPyZnPc were found to be 0.86 and 0.74 in DMSO and 0.83 and 0.76 in pyridine.
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  • Date Issued: 2010

The study of hydroxyoximes and hydroxamic acids supported on macroporous resins and their use in the rapid seperation of metals

  • Authors: Hemmes, Marlene
  • Date: 1979
  • Subjects: Chromatographic analysis , Separation (Technology) , Metal ions , Solvent extraction , Extraction (Chemistry) , Oximes , Metals -- Analysis
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:4453 , http://hdl.handle.net/10962/d1009512
  • Description: Introduction: The macroporous Amberlite XAD resins were coated with LIX-64N and examined for the rate of uptake of copper . XAD-7 was by far the best support and gave a satisfactory rate of uptake up to loadings of 60% (w/w). The specific surface area of XAD-7 was measured by the adsorption of methylene blue from aqueous solution. The area of the wetted resin was five times less than that of the dry resin. LIX-65N was purified and the anti isomer characterised using spectroscopic techniques . The rate of uptake of copper was not improved by use of purified LIX-65N or by addition of LIX-63. XAD-7 coated with LIX-65N was used in columns. Elution curves for copper showed negligible tailing, and rapid separations of copper from iron (111), nickel, cobalt and magnesium by selective absorption were achieved. Copper was concentrated from very dilute solution at a flow rate of 50 ml min -1 ,and a 99% recovery was obtained. The method was applied to the rapid determination of copper in brass and bronze. A series of long-chain hydroxamic acids were synthesised and tested for suitability as stationary phase on XAD-7. Oleohydroxamic acid and naphthenohydroxamic acid were the most promising. The r ate of uptake of copper was reduced by the use of nonylphenol or amyl alcohol as a diluent. The capacities for copper of the hydroxamic acids were less when supported on XAD-7 than when used as liquid ionexchangers. The distribution coefficients of cobalt, nickel, zinc, lead, vanadium, uranium, iron (111) and copper were measured as a function of pH. XAD-7 coated with oleohydroxamic acid was used in columns for the rapid separation of iron (111) from copper and of copper from nickel, cobalt, lead and zinc. Copper was concentrated from very dilute solution at a flow rate of 45 ml min -1 and a 100,8% recovery was obtained. Copper was successfully separated from nickel by selective elution. The elution curves obtained show negligible tailing. The resin loaded with oleohydroxamic acid lost capacity due to chemical instability. Naphthenohydroxamic acid supported on XAD-7 was not suitable for use in columns, because it was physically unstable.
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  • Date Issued: 1979

Résultats des études menées en Angleterre: détermination de la posologie optimale

  • Authors: Woodford, R , Haigh, John M , Barry, B W
  • Date: 1981
  • Language: French
  • Type: Article
  • Identifier: vital:6449 , http://hdl.handle.net/10962/d1006636
  • Description: Les auteurs ont etudie la biodisponibilite et I'activite de formules experimentales et commercialisees de dermocortico'ides en utilisant les essais de vasoconstriction avec et sans occlusion (1, 2, 6, 7, 8, 9). L'application unique de six heures avec lectures multiples a ete largement utilisee dans ce travail et la methodologie en a ete decrite en detail ailleurs (4). Sur la base de ce travail. on a pratique des applications repetees de dermocortico'ides commercialises au Royaume- Uni. en utilisant Ie test du blanchiment de la peau sans occlusion, de maniere a reproduire au plus pres la situation realisee en clinique (3). Ce travail a montre que I'application de cortico'ides trois fois par jour pendant cinq jours aboutissait a une tachyphylaxie considerable de la reponse du blanchiment quelque soit I'activite therapeutique de la formule utilisee. Au bout de deux jours de repos, on a assiste a une recuperation considerable, mais a nouveau une tachyphylaxie aigue s'est installee a la suite d'une nouvelle application triquotidienne.
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  • Date Issued: 1981

Reflections on Teaching Africa in South Africa:

  • Authors: Matthews, Sally
  • Date: 2016
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/142235 , vital:38061 , DOI: 10.1111/1467-9256.12107
  • Description: This article draws on the author’s experience of teaching African Studies to undergraduate South African students in order to reflect on some of the key challenges facing teachers of African Studies, both in South Africa and beyond. In particular, it discusses challenges relating to teaching a field as contested as African Studies, looking at whether teaching African alternatives to mainstream African politics is helpful and at whether and how one can teach Africa in a way that encourages and develops critical thinking. The article also explores how the racial politics of the context in which one teaches African Studies inevitably affects the way in which students engage with the content of the course. While the article discusses these issues in relation to the South African higher education context in particular, implications for other contexts are also highlighted.
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  • Date Issued: 2016

Senior staff party 1980

  • Authors: Henderson, Derek Scott
  • Date: 1980-11-21
  • Language: English
  • Type: Text
  • Identifier: vital:7414 , http://hdl.handle.net/10962/d1018291
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  • Date Issued: 1980-11-21

Labour rights of fishers in Namibia

  • Authors: Hamukuaya, Nghililewanga Hashali
  • Date: 2018
  • Subjects: Labor laws and legislation -- Namibia , Fishing -- law and legislation -- Namibia Employee rights -- Namibia Human rights -- Namibia
  • Language: English
  • Type: Thesis , Masters , LLM
  • Identifier: http://hdl.handle.net/10948/30061 , vital:30815
  • Description: Fishers make an important contribution to the global economy and add value to a country’s gross domestic product. Their contribution is even more important in countries such as Namibia that rely heavily on the fishing industry as a source of income. The working conditions of fishers have recently come under scrutiny as a result of poor labour standards when compared to employees ashore. A background of the working conditions of fishers is provided illustrating the unique working conditions of the fishing industry. After that the international standards, namely those of the United Nations and the International Labour Organisation (hereinafter referred to as “the ILO”), are discussed and the challenges in the regulations of the condition of employment of fishers are pointed out. The ILO recently adopted the Work in Fishing Convention (hereinafter referred to as “the WIFC”) in 2007, which is the primary instrument applicable to fishers’ conditions of employment. Namibia has not ratified the Convention and, as a result, it has no legal obligation to comply with the standards it sets. The international standards were tested against the national legislation of Namibia. This was done to determine the extent of Namibia’s compliance with those standards. The dissertation revealed that, if Namibia were to immediately ratify the Convention it would not conform with the standards and, as a result, would be in breach of its international obligation. The dissertation takes a step further by comparing the approach taken in regulating the conditions of employment in Namibia to the approach taken in South Africa. The purpose of the comparison is to determine the lessons Namibia can learn, if any, to improve the regulation of the condition of employment for its fishers. The dissertation 7 reveals that there are lessons Namibia can learn from South Africa to improve the conditions of employment of the fishers. These lessons relate to introducing a bargaining council and, where necessary, statutory councils for the fishing industry. The introduction of a bargaining council and statutory councils would give organisations such as trade unions more power to negotiate a general standard across multiple sectors within the fishing industry. The standards that are negotiating could incorporate the standards provided in the WIFC even though Namibia has not ratified the convention.
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  • Date Issued: 2018

Assessing the effect of absenteeism in the Eastern Cape Department of Health

  • Authors: Simon, Nobuzwe
  • Date: 2016
  • Subjects: Absenteeism (Labor) Public health personnel Absenteeism (Labor) -- South Africa -- Eastern Cape
  • Language: English
  • Type: Thesis , Masters , MPA
  • Identifier: http://hdl.handle.net/10353/2271 , vital:27736
  • Description: The Department of Health is experiencing repeated negative press releases with the respect to the quality of service delivery in the Eastern Cape. The public sector is an entity that provides a unique service. This is made evident by the services provided such as provision of free health services for primary health care as well as free health services to children under six, disabled and senior citizens. The Eastern Cape Department of Health has developed service standards adopted in 2007 by the Eastern Cape Department of Health. This study aims to determine the casual effect of absenteeism and their relationship to poor service delivery. According to Makhubu (2006) many vacancies in the Eastern Cape Department of Health exist which result in service delivery problems. In terms of the second principle in the Batho Pele Principles the norms and standards which are service standards serves as a baseline where the Department of Public Service and Administration (2007) issued directive that the vacancy rate of any government department should range between ten and fifteen percent Makhubu (2006) further refers to the doctors/patient ratio as one is to three hundred patients (1:300), which is unhealthy and abnormal as the doctor/patient ration in terms of the Health Professional is one is to thirty (1:30). Such cases pose an opportunity to those employees who are within the service to absent themselves from such unhealthy situations and this behavior later result in the exodus (professional drainage) of employee. Schultz, Nel, Gerber, Hassbroek, Van Dyk and Werner (2001:582) define absenteeism as withdrawal of levels of productivity and collegial interaction for a given time to escape a perceived undesirable working environment. This behavior is disruptive to continuous organizational efficiency. Absenteeism is found in two forms that are avoidable and unavoidable. In the unavoidable forms of absenteeism, the situation in unplanned and is governed by external factors, thus it is beyond one’s control and has to be managed differently. Control of absenteeism can exercise by the immediate manager through the human resource section regarding the duration and terms of absence pertaining salary and terms of services.
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  • Date Issued: 2016

Comparative analysis of characteristics of the various sugarcane bagasse types in terms of gasification

  • Authors: Kula, Mpumezo
  • Date: 2016
  • Subjects: Bagasse Sugarcane -- Breeding Coal gasification
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: http://hdl.handle.net/10353/13392 , vital:39656
  • Description: The insight that the fossil fuel reserves are limited, together with concerns over security of supply (i.e. the oil crises), initiated the first raise of interest in biomass and all other renewable energy forms. However, the concern grew that global warming and the resulting climate change were enhanced by carbon dioxide (CO2) emissions resulting from fossil fuel consumption. Meanwhile, biomass energy is thought to account for 14–15percent of total world energy consumption. Hence, the exploitation and utilization of biomass energy are effective and necessary for relieving the pressures caused by environmental pollution and fossil fuel shortage (Lv et al., 2010). Recently, extensive research aimed at converting biomass to useful energy have been carried out, especially pyrolysis and gasification, which are particularly suitable for the effective and efficient utilization of biomass. Sugarcane bagasse is the main byproduct of sugarcane mill, ready available at the production site so that it may be a suitable raw material for the production of biofuels, chemicals, and electricity. Among the methods that have been previously studied, is this particular study we explore thermochemical process, gasification. The properties of sugarcane bagasse relevant to gasification are briefly reviewed. The compositions of the bagasse as a fuel are variable, especially with respect to inorganic constituents important to the critical problems of sintering, fouling and slagging. Alkali and alkaline earth metals, in combination with other fuel elements such as silica and sulfur, are responsible for many undesirable reactions in a gasifier system. The three sugarcane bagasse types namely washed, unwashed and the depithed sugarcane bagasse were subjected in different types of characterization to review and compare their characteristics for gasification. Ultimate analysis was used to determine the elemental compositions and this was helpful in estimating the energy input of the materials. Elemental compositions were determined with the CHNS analyzer which gave the percent compositions of each fuel in terms of Carbon, Hydrogen, Nitrogen, Sulphur as well as Oxygen (by difference) and the SEM/EDX which gave the elemental composition of the materials as can be viewed from the EDX. The proximate analysis which is the physical characterization of the materials was carried out to preview the behavior of the sugarcane bagasse when subjected into high temperatures as the gasification process uses very high temperatures. These were determined by the TGA and the volatile matter content; fixed carbon content, moisture content and ash content were extrapolated from the resulting thermogram. SEM images for surface structures of the bagasse and FTIR for the structural functionality and bonding structures. The characterization of the bagasse was conducted to compare their gasification properties.
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  • Date Issued: 2016
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